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Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Cash	$ 153	$ 121
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents, fair value	2,323	1,628
Total cash and cash equivalents	2,323	1,628
U.S. and Canadian government obligations
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents, adjusted cost	1,902	1,452
Cash equivalents, fair value	1,902	1,452
Other debt obligations
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents, adjusted cost	268	55
Cash equivalents, fair value	268	55
Nonqualified employee benefit trusts
Cash and Cash Equivalents [Abstract]
Available-for-sale securities, amortized cost	16	17
Unrealized Gains	0	3
Unrealized Losses	0	0
Fair Value	$ 16	$ 20

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